# 7.5 Graphing Parabolas (Standard Form) - PowerPoint PPT Presentation

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7.5 Graphing Parabolas (Standard Form). Today’s Date: 1/13/12. Notes on Handout. Ch 7.5 – 7.7 BIG QUIZ is on Fri 1/20. Graphs of Parabolas. “Normal” Vertex (0, 0) Right 1 Up 1 Left 1 Up 1 Right 2 Up 4 Left 2 Up 4. “Skinny”. “Wide”. Properties of Parabolas. Standard Form:.

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7.5 Graphing Parabolas (Standard Form)

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## 7.5 Graphing Parabolas (Standard Form)

Today’s Date:

1/13/12

Notes on Handout

Ch 7.5 – 7.7 BIG QUIZ is on Fri 1/20

“Normal”

Vertex (0, 0)

Right 1 Up 1

Left 1 Up 1

Right 2 Up 4

Left 2 Up 4

“Skinny”

“Wide”

### Properties of Parabolas

Standard Form:

1) Which way does it open? Wide or skinny?

“a” is positive – opens UP

“a” is negative – opens DOWN

│a│> 1 skinny

│a│< 1 wide

│a│= 1 normal

 fraction

### Properties cont…

2) Axis of Symmetry (A of S)

3) Vertex:

### Properties cont…

4) Is the vertex a MAXIMUM or MINIMUM point?

a = (–)

If opens down, vertex is MAX

If opens up, vertex is MIN

a = (+)

5) Extreme value:

“y” part of the vertex

### Properties cont…

( , 0)

when y value is zero

6) x-intercepts:

7) y-intercepts:

( 0, c)

c is y-intercept from SF

• Table of values:

• (only if you need to)

x

y

9) Graph

### Ex 1) Graph

1) Which way does it open? Wide or skinny?

“a” = 3 is positive

– opens UP

│3│> 1

→ skinny

Equation!!

2) Axis of Symmetry (A of S)

### Ex 1 cont…

3) Vertex:

4) Is the vertex a MAXIMUM or MINIMUM point?

a = (+) Opens up, vertex is MIN

5) Extreme value:

( , 0)

6) x-intercepts:

7) y-intercepts:

( 0, 1)

### Ex 1 cont…

• Graph

• Use the A of S

• Normal: Up 1 right 1

• a = 3: Up 3 right 1

• Up 3 left 1

• Table of Values:

• Didn’t need it, but if you do, choose easy points for x and solve for y

• Usually: Choose -2, -1, 0, 1, 2 for x

### Homework

#708

Practice Properties WS